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Noninvasive characterization of the sound pattern caused by coronary artery stenosis using FTF/FAEST zero tracking filters: Normal/abnormal study

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Abstract

In this article, a new approach has been proposed to investigate the extraction of useful information from diastolic heart sounds caused by partially occluded coronary arteries. This method, which estimates and tracks the zeros (poles) of the diastolic heart sounds directly, takes advantage of the FTF/FAEST (Fast Transversal Filters/Fasta Posteriori Error Sequential) technique which possesses the fast convergence property of the Recursive Least Square (RLS) method and the computational simplicity of the Least Mean Square (LMS) method.

In previous studies, the main assumption was that the diastolic heart sounds were a stationary process. Since the production of the heart sounds is not a stationary process, a new approach that performs well not only for stationary but also for nonstationary processes can be required. This requirement can be satisfied by the adaptive FTF/FAEST zero tracking method which provides fast and stable convergence as well as computational efficiency since the adaptive FTF/FAEST zero tracking method is based on the exact minimization of least squares criteria and the filter weights of this method are optimal at each time instant.

The zero trajectories of the diastolic heart sounds were used to diagnose patients as diseased or normal. Results showed that the normal and abnormal records were incorrectly distinguished in only 6 of 35 cases using ablind protocol where analysis was done without knowledge of the actual disease states of the patients. The most discriminant time region of the zero trajectories of the diastolic heart sounds associated with coronary artery disease was between 200 and 300 msec after the second heart sound during the diastolic period.

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Authors and Affiliations

  1. Biomedical Engineering Department, Rutgers University, 08855-0909, Piscataway, NJ

    M. Akay, Y. M. Akay, W. Welkowitz, J. L. Semmlow & J. Kostis

  2. Department of Surgery (Bioengineering), UMDNJ-Robert Wood Johnson Medical School, New Brunswick, NJ

    W. Welkowitz, J. L. Semmlow & J. Kostis

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  1. M. Akay
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  2. Y. M. Akay
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  3. W. Welkowitz
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  4. J. L. Semmlow
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  5. J. Kostis
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Akay, M., Akay, Y.M., Welkowitz, W. et al. Noninvasive characterization of the sound pattern caused by coronary artery stenosis using FTF/FAEST zero tracking filters: Normal/abnormal study. Ann Biomed Eng 21, 175–182 (1993). https://doi.org/10.1007/BF02367612

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  • DOI: https://doi.org/10.1007/BF02367612

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